The U.S. Army's ongoing transformation to Future Combat Systems (FCS) requires a commensurate transformation in training, particularly in the area of command and control (C2). This paper describes research comparing novice versus expert command group performance to identify training recommendations and implications. The research was performed by the U.S. Army Research Institute for the Behavioral and Social Sciences (ARI) in conjunction with the FCS C2 program. Comparative results were based on objective measures of verbal and human-computer interaction (HCI) as well as subjective measures of workload, performance success, training, prototype effectiveness, and human system integration. Significant differences were identified between novice and expert command groups including lower verbalization and HCI rates by novices during enemy target identification, and higher rates of verbalization and HCI by novices in support of the destruction of enemy targets. Training examples were provided for more specific and tangible guidance to training developers and designers. Overall, the findings and training implications underscore the new training requirements for FCS, particularly embedded training, for transforming novices into experts in future command groups.